JPH107893A - Resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin composition in which polyethylene terephthalate and a xylylene group-containing polyamide are mixed to improve gas barrier properties while maintaining transparency and chemical resistance. Aim. SOLUTION: Polyethylene terephthalate 70-98
A resin composition obtained by melt-kneading a mixed resin consisting of 30% to 2% by weight of a xylylene group-containing polyamide and a terminal amino group concentration a (μ equivalent / g) and a terminal carboxyl group concentration b (μ equivalent / g) satisfying both of the following formulas (1) and (2): a resin composition having excellent transparency and gas barrier properties. 50 ≦ ab−300 (1) a + b ≦ 300 (2)

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin composition having good transparency and excellent gas barrier properties, and a film, a sheet, and a container obtained from the resin composition.

[0002]

2. Description of the Related Art Polyethylene terephthalate (hereinafter P)
ET) is widely used as a packaging material for food and the like because it has transparency, chemical resistance, and oil resistance. However, when it is necessary to extend the shelf life of foodstuffs or the contents that are rapidly deteriorated by oxidation, the gas barrier property of PET alone is not sufficient. PET
In order to improve the gas barrier property of PET, a technique of mixing a resin having good gas barrier property to impart gas barrier property to PET is known.

JP-A-58-90033 discloses that a biaxially stretched blow molded bottle obtained by mixing PET and a xylene group-containing polyamide in a biaxially stretched blow bottle exhibits good gas barrier properties. However,
By simply mixing PET and a xylene group-containing polyamide, a gas barrier property is improved, but a bottle having excellent transparency suitable for practical use cannot be obtained. Also, JP-A-63-2
No. 13529 discloses that the gas barrier property is improved while maintaining the transparency of PET by mixing PET with a xylene group-containing polyamide and a graft-modified copolymerized polyester as the third component. However, in this case, it is necessary to incorporate a special third component called a copolyester.

[0004]

SUMMARY OF THE INVENTION In the present invention, PET and polyamide are melt-kneaded without using a third component such as a compatibilizer, and the transparency and chemical resistance of PET are maintained.
An object of the present invention is to provide a resin composition having improved gas barrier properties, and a film, a sheet, and a container obtained from the resin composition.

[0005]

Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, by melting and kneading PET with a polyamide whose terminal group concentration is adjusted to a specific range, transparency is improved. The present inventors have found that a resin composition having excellent gas barrier properties can be obtained, and have reached the present invention.

That is, the present invention relates to a resin composition obtained by melt-kneading a mixed resin composed of 70 to 98% by weight of PET and 30 to 2% by weight of a xylylene group-containing polyamide (total of 100% by weight is total). The terminal amino group concentration a of the xylylene group-containing polyamide before melt-kneading.
(Μ equivalent / g) and terminal carboxyl group concentration b (μ equivalent / g)
g) a resin composition having excellent transparency and gas barrier properties, which satisfies both of the following formulas (1) and (2):
And films, sheets, and containers obtained from the resin composition. 50 ≦ ab−300 (1) a + b ≦ 300 (2)

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The PET used in the present invention may contain a small amount of other ester-forming units as long as its properties are not substantially changed. That is, P in the present invention
The ET contains 20 mol% or less, preferably 10 mol%, of other ester-forming units in addition to the ethylene terephthalate unit.
The following may be contained.

The dicarboxylic acids constituting other ester-forming units include terephthalic acid, isophthalic acid, 4,4 '
-Diphenyldicarboxylic acid, 3,4'-diphenyldicarboxylic acid, 1,4-naphthalenedicarboxylic acid, 1,5-
Aromatic dicarboxylic acids such as naphthalenedicarboxylic acid, 2,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid and the like; or succinic acid, adipic acid, sebacic acid, dodecandioic acid and the like And aliphatic dicarboxylic acids such as 1,4-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, decalindicarboxylic acids, and tetralindicarboxylic acids.

The diols constituting the other ester-forming units include aliphatic glycols such as propylene glycol, trimethylene glycol, diethylene glycol and 1,4-butanediol, and 1,4-cyclohexanedimethanol and 1,3-cyclohexanedimethanol. Examples thereof include alicyclic glycols such as cyclohexanedimethanol and 1,6-cyclohexanediol, and aromatic glycols such as bisphenol A.

[0010] The PET used in the present invention may have its molecular terminals sealed with a small amount of a monofunctional compound such as benzoic acid or methoxypolyethylene glycol. Further, a small amount of a structural unit derived from a polyfunctional compound such as glycerin, trimesic acid, and pentaerythritol may be contained. The PET used in the present invention
The one having a terminal carboxyl group concentration of 15 to 50 μeq / g can be suitably used.

The xylylene group-containing polyamide used in the present invention is a polyamide obtained by a polycondensation reaction between a xylylenediamine component and a dicarboxylic acid component described in the following items (A) and (B).

(A) Xylylenediamine component The xylylenediamine component is mainly composed of xylylenediamine such as meta-xylylenediamine and para-xylylenediamine as a diamine component. Is preferably a diamine component containing 70 mol% or more, particularly preferably a component containing 80 mol% or more of metaxylylenediamine from the viewpoint of functions such as gas barrier properties and crystallinity.

In the xylylenediamine component, other diamine components include aliphatic diamines such as tetramethylenediamine, pentamethylenediamine, hexamethylenediamine, octamethylenediamine, nonamethylenediamine and the like in addition to the above paraxylylenediamine. Aromatic diamines such as phenylenediamine and alicyclic diamines such as 1,3-bisaminomethylcyclohexane and 1,4-bisaminomethylcyclohexane can also be used.

(B) Dicarboxylic acid component The dicarboxylic acid component is a dicarboxylic acid component containing α, ω-linear aliphatic dibasic acid as a main component and having 6 to 1 carbon atoms.
The α, ω-linear aliphatic dibasic acid of 2 is preferably used.

Specific examples of the usable dicarboxylic acid component include aliphatic dicarboxylic acids such as adipic acid, succinic acid, glutaric acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, undecandioic acid and dodecandioic acid. ,
In addition, aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, and 2,6-naphthalenedicarboxylic acid can be used by blending them to such an extent that the function of the present invention is not impaired.
Among the above α, ω-linear aliphatic dibasic acids, adipic acid is preferred, and those containing 60 mol% or more, particularly 80 mol% or more of adipic acid in the dicarboxylic acid component have a suitable fluidity during molding. It is preferable in that it can be obtained.

In the present invention, a xylylene group-containing polyamide mixed with PET (hereinafter abbreviated as MX nylon)
Is the terminal amino group concentration a (μ equivalent / g, hereinafter “a”).
) And the terminal carboxyl group concentration b (μ equivalent / g, hereinafter referred to as “b”) satisfy both of the following expressions (1) and (2). 50 ≦ ab−300 (1) a + b ≦ 300 (2)

In the formula (1), if ab is less than 50, a resin in which the transparency of the mixed resin composition is clearly improved cannot be obtained. On the other hand, if a-b exceeds 300, it becomes practically difficult to synthesize a high-molecular-weight MX nylon having sufficient mechanical performance as a packaging material. Further, even if the MX nylon satisfies the condition of the formula (1), if a + b in the formula (2) exceeds 300, the molecular weight of the obtained MX nylon is small, and practical mechanical performance cannot be obtained.

The resin composition of the present invention comprises a PE
T and MX nylon, PET is 70 to 98% by weight, M
This is a resin composition obtained by blending X nylon at a ratio of 30 to 2% by weight (here, the total of the weight% is 100% by weight, the same applies hereinafter) and melt-kneading. Note that P
The mixing ratio of ET and MX nylon is 80% for PET.
~ 98% by weight, MX nylon is preferably 20 ~ 2% by weight, PET is 85 ~ 94% by weight, MX nylon is 15 ~
6% by weight is particularly preferred. In the mixing of PET and MX nylon, the mixing ratio of MX nylon is preferably 30% by weight or less in order to maintain the properties such as chemical resistance characteristic of PET. In order to impart gas barrier properties, it is necessary to mix at least 2% by weight of MX nylon.

The reason why the transparency is improved by melt-kneading the MX nylon and PET used in the present invention is not clear, but the reaction between the terminal amino group of MX nylon and the terminal carboxyl group of PET is determined by the transparency of the mixed resin. It is presumed to be involved in

The resin composition of the present invention comprises the above PET and M
X nylon is obtained by mixing in a molten state.
A mixture of T and MX nylon in a solid state like a pellet (dry blending) may be melt-kneaded and used for molding. At this time, the mixed resin is melt-kneaded in a molding machine generally used for plastics such as an extruder and an injection molding machine. Alternatively, the resin once kneaded and pelletized in a molten state by a single-screw extruder, a twin-screw extruder, a kneader or the like may be molded again by an extruder or an injection molding machine. The films, sheets and containers obtained in this way all have good transparency and gas barrier properties. The melt kneading conditions may be ordinary melt kneading conditions, and no special conditions or operations are required.
The temperature is 60 to 300 ° C, preferably 260 to 280 ° C, and the melt-kneading time is 30 to 240 seconds, preferably 50 to 180 seconds.

The film or sheet in the present invention is an unstretched sheet or film obtained by a known method such as extrusion of the above resin composition, and such an unstretched film or sheet (hereinafter simply referred to as “sheet”). Film ") which is processed by a known method such as stretching.

The film can be obtained by a known method such as a melt extrusion method such as a T-die method or an inflation method or a calendar method. For example, in the T-die method, the above resin composition is melted in an extruder, extruded through a T-die, and a non-stretched film is obtained through a cooling roll and a winder. The extruder may use a twin screw extruder. Further, the above resin composition may be used as a composite by lamination with another resin or paper. Lamination is performed by a coextrusion method, a lamination method, an extrusion coating method, or the like. Further, the film may be subjected to processing such as stretching by a known method. For example, the unstretched film is stretched by heating to a temperature equal to or higher than the glass transition point of PET or MX nylon. Stretching can be performed by a conventionally known method such as simultaneous biaxial stretching and sequential biaxial stretching.
Generally, the stretching ratio is preferably 4 to 25 times in area ratio. The stretched film may be heat-set if necessary. The stretched film thus obtained has good transparency and gas barrier properties.

The container in the present invention is obtained by molding the above resin composition by a known method. For example, vacuum forming,
The sheet is thermoformed by pressure forming or the like to form a cup or tray-shaped container. Further, a tubular container may be formed by heat fusion or the like. The sheet to be formed may be a sheet laminated with another resin as necessary. Lamination can be carried out in the same manner as for a non-stretched film. The container can also be obtained by direct blow molding such as extrusion blow molding and injection blow molding. For example, in extrusion blow molding, a blow-molded pipe is melt-extruded before being cooled. Extrusion may be co-extruded with other resins.

In the injection blow molding, a parison is formed by injection molding, and then blow molding is performed. The parison may be co-injected with another resin. Further, the container can be obtained by stretch blow molding such as injection stretch blow molding and extrusion stretch blow molding. For example, in injection stretch blow molding, a biaxially stretched blow bottle is obtained by adjusting the temperature of a bottomed parison injection molded in advance and blow molding. Injection stretching can be performed by either adjusting the temperature of the injection-molded parison to a temperature suitable for stretching below the glass transition point and lower than the melting point, and then performing blow molding, or by cooling the parison once to room temperature, reheating, and then performing blow molding. Blow molding may be performed. The parison may be co-injected with another resin. Also, in the extrusion stretch blow molding, after forming the pipe by extrusion molding and cutting to a certain size, heat both ends of the pipe to form the mouth and bottom,
Next, the temperature is adjusted and stretch blow molding is performed. Extrusion may be co-extruded with other resins. In addition, the container can be obtained by sheet blow molding, compression stretch blow molding, or the like. The resulting container has good transparency and gas barrier properties.

[0025]

Examples are shown below. The measurement in the examples was based on the following method. 1. Haze Measurement standard: Conforms to ASTM D1003, JIS K7105 Measurement equipment: Nippon Denshoku Industries Co., Ltd., Model: Z-Σ80 Color Measuring System
m) Measurement conditions: transmission method

2. Oxygen permeability measurement (OTR) Measurement standard: Compliant with ASTM D3985, JIS K7126 Measurement equipment: Modern Control Company (MODERN CONTOROL
S), model: OX-TRAN10 / 50A Measurement conditions: 1) In Examples 1 and 2 and Comparative Examples 1 to 3, the measurement temperature was 23 ° C and the relative humidity was 60%. 2) In Examples 3 and 4 and Comparative Examples 4 to 6, the measurement temperature was 23 ° C, the relative humidity was 50% on the outside of the bottle, and 1 on the inside.
00%. The inner volume of the bottle is 1.5 liters and the outer surface area is 0.074 m ² .

3. Measuring Method of Terminal Group Concentration Terminal Carboxyl Group Concentration of MX Nylon Approximately 0.3 g of a sample was taken in 30 cc of a benzyl alcohol solvent, heated under a stream of nitrogen to dissolve the sample, cooled, and subjected to potentiometric titration. 0.01N NaO for titration
H aqueous solution was used. Terminal amino group concentration of MX nylon Solvent (phenol / ethanol mixed solvent (mixing volume ratio:
4/1)) About 0.6 g of a sample was taken in 30 cc, dissolved, and subjected to potentiometric titration. For titration, a 0.01 N aqueous hydrogen chloride solution was used. Terminal carboxyl group concentration of PET Solvent (O-cresol / chloroform / 1,1,2,2
-Tetrachloroethane (mixing weight ratio: 70/15/1
5)) About 1.5 g of a sample was taken in 50 ml, heated to dissolve the sample, and subjected to potentiometric titration. For the titration, a 0.1 N KOH-ethanol solution was used.

Example 1 PET (manufactured by Nippon Unipet Co., Ltd., trade name: RT54)
3, 80 parts by weight of terminal carboxyl group concentration: 30 μ equivalent / g) and MX nylon (manufactured by Mitsubishi Gas Chemical Co., Ltd., a: 10
5 μeq / g, b: 34 μeq / g, thus ab = 7
Pellets obtained by kneading 20 parts by weight of 1, a + b = 139) in a molten state using a twin-screw extruder (manufactured by Ikegai Iron Works Co., Ltd., screw diameter: 45 mmφ) (hereinafter referred to as melt blending). Using a single screw extruder (Toyo Seiki Co., Ltd., screw diameter 20 mmφ), cylinder temperature 270 ° C
It was melted at ２280 ° C. and extruded from a T-die to obtain a non-stretched film having a thickness of about 300 μm via a cooling roll. The haze of this film was 9% in terms of a thickness of 300 μm. Next, the obtained sheet was simultaneously biaxially stretched (area stretching ratio 16 times) using a biaxial stretching machine (manufactured by Toyo Seiki Co., Ltd., biaxial stretching apparatus, tenter method) to obtain a stretched film. The haze of this stretched film was 9% in terms of a thickness of 30 μm. The measured value of the oxygen permeability is 0.35 cc · mm
/ M ² · day · atm.

Example 2 PET (manufactured by Nippon Unipet Co., Ltd., trade name: RU58)
3, 80 parts by weight of terminal carboxyl group concentration: 19 μeq / g) and MX nylon (manufactured by Mitsubishi Gas Chemical Co., Ltd., a: 11)
7 μeq / g, b: 26 μeq / g, therefore ab = 9
1, a + b = 143) 20 parts by weight of a melt-blended pellet was melted at a cylinder temperature of 270 ° C. to 280 ° C. using a single screw extruder (used in Example 1) and extruded from a T-die. An unstretched film having a thickness of about 300 μm was obtained via a cooling roll. The haze of this film was 9% in terms of a thickness of 300 μm. Next, the obtained sheet was subjected to simultaneous biaxial stretching (area stretching ratio 16 times) using a biaxial stretching machine (the one used in Example 1) to obtain a stretched film. The haze of this stretched film was 3% in terms of a thickness of 30 μm. The measured value of the oxygen permeability is 0.3
It was 6 cc · mm / m ² · day · atm.

Comparative Example 1 PET (trade name: RT54, manufactured by Nihon Unipet Co., Ltd.)
3) 80 parts by weight and MX nylon (Mitsubishi Gas Chemical Co., Ltd.)
A: 38 μeq / g, b: 87 μeq / g, ab = −49, a + b = 125) 20 parts by weight of a melt-blended pellet obtained by a single screw extruder (Example 1). Cylinder temperature 270 ° C
It was melted at ２280 ° C. and extruded from a T-die to obtain a non-stretched film having a thickness of about 300 μm via a cooling roll. The haze of this film was 22% in terms of a thickness of 300 μm. Next, the obtained sheet was simultaneously biaxially stretched (area stretch ratio 16
Times) to obtain a stretched film. The haze of this stretched film was 30% in terms of a thickness of 30 μm. The measured value of the oxygen permeability was 0.40 cc · mm / m ² · day · atm.

Comparative Example 2 PET (trade name: RT54, manufactured by Nippon Unipet Co., Ltd.)
3) 80 parts by weight and MX nylon (Mitsubishi Gas Chemical Co., Ltd.)
(A: 25 μeq / g, b: 25 μeq / g, and therefore ab = 0, a + b = 50) were melt-blended into pellets obtained by a single screw extruder (Example 1).
270 ° C to 28 cylinder temperature
It was melted at 0 ° C. and extruded from a T-die to obtain an unstretched film having a thickness of about 300 μm via a cooling roll. The haze of this film was 20% in terms of a thickness of 300 μm. Next, the obtained sheet was subjected to simultaneous biaxial stretching (area stretching ratio 16 times) using a biaxial stretching machine (the one used in Example 1) to obtain a stretched film. The haze of this stretched film is 3
It was 20% in terms of a thickness of 0 μm. The measured value of the oxygen permeability was 0.39 cc · mm / m ² · day · atm.

Comparative Example 3 PET (manufactured by Nihon Unipet Co., Ltd., trade name: RT54)
3) was melted at a cylinder temperature of 270 ° C. to 280 ° C. using a single-screw extruder (used in Example 1) and extruded from a T-die to obtain an unstretched film having a thickness of about 300 μm via a cooling roll. The haze of this film was 1% in terms of a thickness of 300 μm. Next, the obtained sheet was subjected to simultaneous biaxial stretching (area stretching ratio 16 times) using a biaxial stretching machine (the one used in Example 1) to obtain a stretched film. The haze of this stretched film was 1% in terms of a 30 μm thickness. The measured value of oxygen permeability is 1.94 cc · mm / m ² · da
y · atm.

Example 3 PET (trade name: RU58, manufactured by Nihon Unipet Co., Ltd.)
3) 96 parts by weight and MX nylon (Mitsubishi Gas Chemical Co., Ltd.)
Injection molding machine (Meiki Seisakusho Co., Ltd.) obtained by dry blending 4 parts by weight of a: 181 μeq / g, b: 17 μeq / g, ab = 164, a + b = 198. A bottomed preform having a weight of 55 g and a total length of 150 mm was molded using a model (M200 molding machine manufactured by Co., Ltd.). The obtained preform was subjected to biaxial stretching blow molding using a blow molding machine (LB-O1 blow molding machine, manufactured by Corpoplast) to obtain a total length of 305 m.
m, a bottle having an inner capacity of about 1500 ml was molded. The haze of the obtained bottle was 4% in terms of a thickness of 300 μm. The measured value of oxygen permeability is 0.19 cc · mm / m ² · day
・ It was atm.

Example 4 PET (manufactured by Nippon Unipet Co., Ltd., trade name: RU58)
3) 80 parts by weight and MX nylon (Mitsubishi Gas Chemical Co., Ltd.)
A: 181 μeq / g, b: 17 μeq / g, and therefore ab = 164, a + b = 198) by injection molding machine from a mixed resin obtained by dry blending (Example 3) Was used to form a bottomed preform having a weight of 55 g and a total length of 150 mm. The obtained preform was subjected to biaxial stretch blow molding using a blow molding machine (the one used in Example 3) to perform a total length of 305 m.
m, a bottle having an inner capacity of about 1500 ml was molded. The haze of the obtained bottle was 18% in terms of a thickness of 300 μm. The measured value of the oxygen permeability is 0.04 cc · mm / m ² · day
・ It was atm.

Comparative Example 4 PET (trade name: RT54, manufactured by Nippon Unipet Co., Ltd.)
3) 96 parts by weight and MX nylon (Mitsubishi Gas Chemical Co., Ltd.)
A: 15 μeq / g, b: 65 μeq / g, ab = −50, a + b = 80) 4 parts by weight of an injection molding machine (Example) 55g, total length 150
A preform with a bottom of mm was molded. The obtained preform was subjected to biaxial stretch blow molding using a blow molding machine (the one used in Example 3) to form a bottle having a total length of 305 mm and an internal capacity of about 1500 ml. The haze of the obtained bottle was 11% in terms of a thickness of 300 μm. The measured value of the oxygen permeability was 0.21 cc · mm / m ² · day · atm.

Comparative Example 5 PET (manufactured by Nihon Unipet Co., Ltd., trade name: RT54)
3) 80 parts by weight of MX nylon 20 used in Comparative Example 4
Using a mixed resin obtained by dry blending the parts by weight, an injection molding machine (the one used in Example 3) was used to weigh 55 parts.
g, a bottomed preform having a total length of 150 mm was formed.
The obtained preform was subjected to biaxial stretch blow molding using a blow molding machine (the one used in Example 3) to perform a total length of 30.
A bottle having a size of 5 mm and a capacity of about 1500 ml was formed. The haze of the obtained bottle was 33% in terms of a thickness of 300 μm. The measured value of the oxygen permeability is 0.05 cc · mm / m ² ·
day and atm.

Comparative Example 6 PET (trade name: RT54, manufactured by Nippon Unipet Co., Ltd.)
Injection molding machine using 3) (used in Example 3)
Was used to form a bottomed preform having a weight of 55 g and a total length of 150 mm. The obtained preform was subjected to biaxial stretch blow molding using a blow molding machine (the one used in Example 3) to form a bottle having a total length of 305 mm and an internal capacity of about 1500 ml. The haze of the obtained bottle was 1% in terms of a thickness of 300 μm. The measured oxygen permeability was 0.37 cc · mm / m ² · day · atm.

[0038]

Table 1 Evaluation results of film Examples, Comparative Example No. Real-1 Real-2 Ratio-1 Ratio-2 Ratio-3 Resin composition PET weight part 80 80 80 80 100 PA weight part 20 20 20 200 PA terminal group Concentration a-b µ equivalent / g 71 91 -49 0-a + b µ equivalent / g 139 143 125 50-Haze of film No stretching% / 300 µm 9 9 22 201 Stretching% / 30 µm 9 3 30 20 1 OTR cc -mm / m ² -day-atm 0.35 0.36 0.40 0.39 1.94 Abbreviation PET: Polyethylene terephthalate a: Terminal amino group concentration PA: MX nylon b: Terminal carboxyl group concentration

[0039]

Table 2 Evaluation results of biaxially stretched blow bottles Example, Comparative Example No. Real-3 Real-4 Ratio-4 Ratio-5 Ratio-6 Resin composition PET parts by weight 96 80 96 80 100 PA parts by weight 4 20 4 20 0 PA terminal group concentration ab μequivalent / g 164 164 -50 -50 −a + b μequivalent / g 198 198 80 80 −Haze % of bottle / 300 μm 4 18 11 33 1 OTR cc-mm / m ² -day -atm 0.19 0.04 0.21 0.05 0.37 Abbreviation PET: Polyethylene terephthalate a: Terminal amino group concentration PA: MX nylon b: Terminal carboxyl group concentration

[0040]

According to the present invention, PET and MX nylon are melt-kneaded without the presence of the third component to obtain a resin composition having improved gas barrier properties while maintaining the transparency and chemical resistance of PET. In addition, films, sheets and containers can be obtained from the resin composition.

Claims (3)

[Claims] 1. Polyethylene terephthalate 70-98
A resin composition obtained by melt-kneading a mixed resin composed of 30% to 2% by weight of a xylylene group-containing polyamide (the total of 100% by weight is 100% by weight), and the xylylene group before melt-kneading. Transparency and gas wherein the terminal amino group concentration a (μ equivalent / g) and the terminal carboxyl group concentration b (μ equivalent / g) of the containing polyamide satisfy both of the following formulas (1) and (2): A resin composition with excellent barrier properties. 50 ≦ ab−300 (1) a + b ≦ 300 (2) 2. The resin composition according to claim 1, wherein the xylylene group-containing polyamide is a polyamide obtained from meta-xylylenediamine and adipic acid. 3. Polyethylene terephthalate 70 to 98
A resin, which is obtained by melt-kneading a mixed resin consisting of 30% by weight and a xylylene group-containing polyamide of 30 to 2% by weight (the total of the weight% is 100% by weight) and molding, a film, a sheet,
And the container, wherein the terminal amino group concentration a (μ equivalent / g) and the terminal carboxyl group concentration b (μ equivalent / g) of the xylylene group-containing polyamide before melt-kneading are represented by the following formulas (1) and (2). Films, sheets and containers excellent in transparency and gas barrier properties that satisfy both conditions. 50 ≦ ab−300 (1) a + b ≦ 300 (2)